Buggy code:
public class UtilityMethods { @ SuppressWarnings ( "unchecked" ) public static < T > T [ ] concat ( T item , T ... items ) { } public static < T > List < T > concat ( T item , List < T > items ) { } public static < T > Collector < T , ? , LinkedHashSet < T > > toLinkedSet ( ) { } public static < T > LinkedHashSet < T > asLinkedSet ( T ... elements ) { } public static < T > Set < T > asSet ( T ... elements ) { } public static < R > Map < String , R > putAll ( Map < String , R > model , String prefix , Map < String , R > subModel ) { } public static < R > Map < String , R > prefix ( String prefix , Map < String , R > subModel ) { } public static < R > Map < String , R > subMap ( String prefix , Map < ? , R > map ) { } public static < R > Map < R , String > toStrings ( Map < R , ? > input ) { } public static Map < String , String > transformToSingleValueMap ( Map < String , String [ ] > map ) { } public static < K , V > MapBuilder < K , V > map ( K firstKey , V firstValue ) { } public static < T > Optional < T > getOther ( Set < T > set , T ... items ) { } public static < R > Optional < R > firstSuccess ( Supplier < Optional < R > > ... fns ) { } public static < T > List < T > reverse ( List < T > original ) { } public static String decode ( String string ) { } public static String killWhitespace ( String s ) { } public static void ifPresent ( String string , Consumer < String > fn ) { } public static < T , R > Optional < R > optMap ( Optional < T > in , Function < T , Optional < R > > fn ) { } public static String convert ( byte [ ] bytes ) { } private static final Pattern localeMatcher = Pattern . compile ( "^([^_]*)(_([^_]*)(_#(.*))?)?$" ) ; public static Locale parseLocale ( String value ) { } public static boolean isEmpty ( String s ) { } public static Date toSqlDate ( LocalDate date ) { if ( date == null ) return null ; <START_BUG> return new Date ( ( ( ( ( ( date . toEpochDay ( ) ) * 24 ) * 60 ) * 60 ) * 1000 ) ) ; <END_BUG> } public static boolean safeEquals ( Object a , Object b ) { } public static < T > boolean change ( T current , T newValue , Consumer < T > fn ) { } public static String orEmpty ( String surname ) { } public static < T > String orEmpty ( T object , Function < T , String > fn ) { } public static < T , R > R orNull ( T object , Function < T , R > fn ) { } public static < T > Optional < T > orElseMaybe ( Optional < T > opt , Supplier < Optional < T > > supplier ) { } public static < T > Supplier < T > once ( Supplier < T > supplier ) { } public static < T > Supplier < Optional < T > > setOnce ( Supplier < Optional < T > > supplier , Consumer < T > setter ) { } public static < T > Stream < T > stream ( Optional < T > opt ) { } public static < A , B > Optional < B > chain ( Optional < A > start , Function < A , Optional < B > > fn ) { } public static < A , B > void ifPresent ( Optional < A > start , Function < A , Optional < B > > fn , Consumer < B > cn ) { } public static < A , B > B applyOrNull ( A start , Function < A , B > fn ) { } public static < A , B > B applyOrDefault ( A start , Function < A , B > fn , Function < A , B > defaultFn ) { } public static < T > boolean equalsAny ( T value , T ... expected ) { } public static < T > Optional < T > findLast ( Stream < T > stream ) { } public static < T > Optional < T > findLast ( Collection < T > collection ) { } public static < T > Optional < T > findPrevious ( T item , Collection < ? extends T > collection ) { } public static < T > Optional < T > findNext ( T item , Collection < ? extends T > collection ) { } public static boolean notNull ( Object o ) { } public static boolean isNull ( Object o ) { } }

Fix:
return new Date ( ( ( ( ( ( ( date . toEpochDay ( ) ) + 1 ) * 24 ) * 60 ) * 60 ) * 1000 ) ) ;